Font is always included via http

If you run your blog on https IE and Firefox will show Warnings about unsecure contents on the site.

Patch:

diff --git a/functions.php b/functions.php
index 60c655b..36d759a 100755
--- a/functions.php
+++ b/functions.php
@@ -107,7 +107,7 @@ function displace_scripts() {
 	wp_enqueue_style( 'genericons', get_template_directory_uri() . '/fonts/genericons/genericons.css', array(), '3.0' );

 	// Add Roboto Slab font.
-	wp_enqueue_style( 'roboto-slab', 'https://fonts.googleapis.com/css?family=Roboto+Slab:400,700,300&subset=latin,cyrillic', array(), null );
+	wp_enqueue_style( 'roboto-slab', '://fonts.googleapis.com/css?family=Roboto+Slab:400,700,300&subset=latin,cyrillic', array(), null );

 	// Load main stylesheet.
 	wp_enqueue_style( 'displace-style', get_stylesheet_uri() );